Electric heater.



PATENTED AUG. 21, 1906.

A. H. OARLSON.

. ELECTRIC. HEATER. APPLICATION FILED JUNE so 1905 2 sums-sum 1.

5 HHHHHHHHIH IHII Affomeys,

'NO- 829,318.- PATENTED AUG. 21, 1906.

A. H. GARLSON.

ELECTRIC HEATER.

APPLICATION PILEILJUNE so, 1905.

2 SHEETS-SHEET 2.

- I "Z/WE/VTOR H. Umv' Altorney s To all whom it may concern:

EEPENT orrron .AXEL H. eAaLsoN, or rsiLAnELPHiA, PENNSYLVANIA, ASSIGNORor ONE-HALF To -vAN1A.

v Specification of Letters Patent.

ELEoTruo HEATER.

hpplication filed t me so, 1905. Serial No. 267,756.

' lowing to be a full, clear, and exact description of the invention,such as will "enable others skilled in theart to which it appertains tomake and use the same.

My present invention is an improvement in electric-heating devices forheating air.

It consists in certain new constructions and combinations of partswhereby a cheap and effective electric heater for air is produced. I

In the accompanying drawings I have illustrated the best form. in whichI have contemplated embodying my said invention, and said invention isdisclosed in the following description and claims. 1

In the drawings, Figure 1 is a plan view with top removed of myimproved-heater,

showing the air-passages above the heating coils. Fig. .2 is alongitudinal vertical section. Fig. 3 is a like view showing anairheatin com )artment both above and below the heating-coils. Fig. 4 isa view of my heater with. connections for heating a house or otherbuilding. Fig. 5 is a transverse .ver

4 tical section of the devices shown in Figs. 1

to the l'ieating coils are secured. I

' forcing device is; connected with the air-inlet, 'asshown in Fig. 4..i

:The. operation of the device will be readily and 2.

In the drawings, A is the outside or inclosing cas ng.

In Figs. 1 and 2 a partition (1 divides the interior of the casing Ainto two compartments. The lower compartment is quite shallow, and in itare placed the electricheater coils I). These coils preferably ex tendlongitudinally of the casing A. The upper and larger compartment of thecasing is provided with plates a, eXtending alten nately from oppositesid es of the casing, each plate extending to nearthe opposite side ofthe casing, forming a zigzag passage from one end of the heater-casingto the other. At one end is the air-inlet pipe or opening (1- and. atthe other is the outlet (i for the heated air. I) b are thebinding-posts to which the electric conductors for supplying electricityAn air understood. An electric. current having been thrown lnto theheating-coils Z), the air RICHARD GRAHAM, or PHILADELPHIA. PENNSYL-.

PatentedAug. 21,1906.

forcing device connected with the air-inlet is put in operation, forcingair into and through f the tortuous course formed by the plates a in theupper compartment of the heater. These plates being in contact orconnected with the division-plate (1. become highly heated, and the airpassing through the heater is raised to a high degree of heat by them.

I The heated air is conducted by suitable piping to the place at whichit is desired to utili'ze the same.

Such a number of heatingcoils are employed as will secure the desiredresults. In. the construction shown in Figs. 1, and 2 the plate orpartition immediately above such coils is coated with an enamel which isa non-conductor of electricity, but a good conductor of heat. Thiscoiling is shown at m,

Fig. 2; The coils are made to lie in contact with such enainaledsurface, while a substance thatis a non-conductor of heat is placedbetween the coils and the plate below them, (see :c, Fig; 2.) i

In Fig. 3 I have shown a construction in which an air-heating chamber isprovided above and. below the heating-coils. Such heating-chambers areconstructed with. heat ing-plates a a, as in the form of my device shownin Figs. 1 and 2. In this form thepartition above and below the coils iscoated with an electrical insulatin enamel just spoken of and the coilsbrought into contact with both. Of the two heating-compartments thelower is provided with the air-inlet a and the upper with the air-outleta, and the two are connected at the opposite end by the passage (1extending from one to the other, or by a pipe connection. (Shown indotted lines.)

In Fig. 4' I have shown the sim ler form of construction withconnections in icated. -In

this view A is the casing of my heater. As shown in Figs. 1 and 2,A isthe pipeconnecting it with the blower B.- A is the outlet pipe, and Bapipe connecting the inlet and outlet air-pipes. In this pipe is a cockI), by the manipulation of which the cooler air'can be admitted to theoutgoing volume of heated air to lower the temperature of the same whendesired, and the pipe A? is provided with a cock or valve (i by whichthe flow of heated air through the pipe may be regulated.

- rents of'air after the manner indicated in with the heated (l is theswitchboard, upon which are the electrical controlling devices. heseinclude the ordinary switch a and a variablesl'esistance device 0. p

If the heater should be made large enough to heat a plurality of rooms,the outgoing airpipe A may be made 'to'connect with a numher of pipes dd (1, leading to the rooms to be heated. If the construction isquite-large, I should prefer to place what I call a -n1iXer between thepipe A and the distributing-pipes d d d in order that anycold airintroducedby thepipe B may air and not be'delivered to any one or two ofthe dist ibiltingpipes. This mixer is merely. a receptacle containingbaffle-plates or horizontally-disposed partitions of wire-gauze orperforated metal or any other of the .well-known constructions forbreaking up and diflusing jets or curdotted lines in the drawings.

The relative proportions of the different parts may be varied withoutdeparting from the s irit of my invention, and I therefore do not esireto be limited to the exact details of the construction shown anddescribed.

What I claim, and desire to secure by Letters Patent, i.s

1. The electric air-heating device comprising the air-heating chamberprovided with the tortuous air-passage, defined by 4 plates in contactwith'the walls of said cham bar and heating-coils in conductive relationto one of the walls of said chamber, substantially as'described.

2. The electric heating the air heating chamber extended air heatingplates in contact with the upper and lower walls of said chamber,heating-coils in coiiductive relation to the lower wall of said chamberand an air-forcing device connected with the inlet, substantially asdescribed.

device comprising provided with an passage defined by 3. In an electricheater, the combination ,1

with the casing, of means dividing the casing into air-heating space andspace for the heattrio heating coils in be thoroughly commingleding-coilis, plates withinsaid aihheating space defining a tortuouspassage for the air, electric coils for upplying heat to the air-heatingspace an. said plates, and anair-lnlet to the said air-heating space,substantially as described. H v

4. In an electricheater, the combination .with the casing, of meansdividing the easing into air-heating space and space for the heat-'ing-coils, plates within said heating-space forming a-tortuou's passagefor the air, ele c' the space for the same for heating the air-heatingspace and the said plates, an air-inlet and an air-outlet, and an" airforcingvdevice connected with said airinlet, substantially as described.I

- 5. In an electric heater, the combination with the electricheating-coils, of air-heating means consisting of a tortuous passage forsaid air in conductive relation to said, coils, an air-inlet andanair-outlet, an air-forcing device connected with the airinlet,means fordistributing the air and a connection between the air-outlet of theheater and said distributing means, substantially as described.

6. In an electric heater, the combination with the heating-coils, ofsage in conductive relation with said heatin passage, an air-forcingdevice connected with said air-inlet, means for distributing the anair-heating pasi 0011s, an air-inlet and an air-outlet for said heatedair, a pipe or other'connection be tween said outlet and theair-distributing means, a direct connection between the airforcingdevice and the pipe leading to the distr buting means, said pipe orconnection

